Find the mean deviation about the mean for the data :`x_i` 10 30 50 70 90`f_i` 4 24 28 16 8

Explanation

To find the mean deviation about the mean for the given data, we will follow these steps:

### Step 1: Calculate the Mean (x̄)
We need to calculate the mean using the formula:

\[ x̄ = \frac{\Sigma (f_i \cdot x_i)}{\Sigma f_i} \]
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